CN2918714Y

CN2918714Y - Float type pumping rod centralizer

Info

Publication number: CN2918714Y
Application number: CN 200620121698
Authority: CN
Inventors: 蔺吉荣; 李广明
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-09
Filing date: 2006-07-09
Publication date: 2007-07-04
Anticipated expiration: 2016-07-09

Abstract

The utility model relates to a drifting pumping rod centralizer, belonging to an auxiliary device arranged on a pumping rod in mechanical oil extraction engineering, which is characterized in that the centralizer cross section is a long roundness composed of 4 arcs; the radius of either the arc between point a and point b or the arc between the point c to point d is bigger than the oil pipe inner radius; the upper end and the lower end of the centralizer have arc fillets and either of the fillets has two contact points when contacting the oil pipe inner wall; and a small crescent-shaped gap is arranged between the two contact points. The utility model has the advantage that the small gap formed between the centralizer and the oil pipe wall can form an oil underlayer provided with a certain pressure, which makes the centralizer drift to the center so as to reduce the pressure applied on the oil pipe and protect the oil pipe from damaging; meanwhile the centralizer is also under protection to realize the purpose of extending the service life. The lower end of the core rod is riveted with the low connector thought rivets to ensure the production safety.

Description

The drifting type oil pumping rod centering device

Technical field

The utility model relates to a kind of corollary apparatus on the sucker rod in the mechanical oil recovery engineering.

Background technology

When oil well adopted reciprocating machine to recover the oil, sucker rod pumped in oil pick-up tube.For various reasons, oil pipe often is not vertical, the meeting that has bends, and has plenty of inclination, when sucker rod moves up and down therein, its box cupling meeting and tube inner wall rub, time has been grown, and oil pipe and rod collar all can damage, and will keep in repair, not only influence oil well production, also will increase cost of production.For head it off, in the oil recovery field by using multiple oil pumping rod centering device is arranged at present, the most frequently used have nonmetal making as nylon centralizer and metal make as rolling wheel centralizer.The nylon centralizer is the cylinder of making of nylon material, and diameter is slightly less than pipe aperture, and external surface has skewed slot, is installed on the sucker rod.This centralizer itself is wearing and tearing easily, and application life is short, need often to change.The employing rolling wheel centralizer is also arranged, and it is to be installed on the centralizer body by the roller that metal is made, when it moves up and down with sucker rod, roller rolls at the oil pick-up tube inner surface, can play the effect of setting upright sucker rod, but has grown the time, the roller of metal and oil pipe also can damage, and its application life is also shorter.

Technology contents

The purpose of this utility model is a kind of drifting type oil pumping rod centering device of design, can prolong the application life of centralizer, reduces production costs.

Technical solution of the present utility model is to realize like this, a kind of drifting type oil pumping rod centering device, constitute by the centralizer body that is sleeved on the core bar, core bar is connected with lower contact by screw thread, its special character is, (1) cross-sectional profile of centralizer body is a Long Circle, and this Long Circle is made up of 4 sections circular arcs, and the arc radius between arc radius between the some a-point b and the some c-point d is greater than the interior pore radius of oil pipe.(2) oblong center to the oblong circumference beeline greater than the rod collar radius.(3) top and bottom of centralizer body have the chamfering of circular arc respectively.

In above-mentioned technical solution, its special character also is, by rivet core bar lower end and lower contact is riveted together.

Usefulness of the present utility model is, (1) because the cross-sectional profile of centralizer body is a Long Circle, and its center beeline to the oblong circumference can avoid rod collar and oil pipe to rub greater than the rod collar radius.The Long Circle that this Long Circle is made up of 4 sections circular arcs, arc radius between arc radius between the some c-point d and the some a-point b is greater than the radius of oil pipe endoporus, it has 2 contact point c and some d (or some a, some b) when contacting with tube inner wall in oil pipe, between a c and some d, the external surface of centralizer body and the inner surface of oil pipe are discontiguous, and a meniscate small gap is arranged.When this centralizer and sucker rod move together, because of the top and bottom of centralizer all have circular-arc chamfering, crude oil in the oil pipe will form oil film wedge and enter into meniscate slit, formation has the lubricating pad layer of certain pressure, and centralizer body will drift about to the oil pipe center under the effect of this pressure, thereby alleviate pressure to oil pipe, can reduce wearing and tearing effectively, also can reduce wearing and tearing simultaneously, reach the purpose that increases the service life centralizer body to oil pipe.(2) the core bar lower end, rivets together them by rivet with after lower contact is connected by screw thread again, can guarantee that its long-term use can not thread off yet, and ensures safety in production.(3) profile because of centralizer body is a circular arc, and the processing and manufacturing ratio is easier to, and cost is lower.

Description of drawings

Fig. 1 is a part section structural representation of the present utility model.

Fig. 2 is that the utility model is installed in the schematic cross section in the oil pipe.

The specific embodiment

Select for use the 20Cr alloy material to make centralizer body 2, the profile of its cross section is made Long Circle, because of the interior pore radius of oil well oil conduit is 31 millimeters, so arc radius between the some a-point b and the arc radius of putting between the c-point d are 31.2 millimeters.Point a-point d, some b-point c adopt circular arc to connect, and make its connection smoothly, form a Long Circle, and to make oblong center be 24 millimeters (the rod collar radius is 23 millimeters) to oblong circumference beeline.The centralizer body of making 2 should have hardness HRC58-62 and the thick poor degree 0.8 μ m in surface, and the upper end of core bar 1 has the sucker rod internal thread.Centralizer body 2 is enclosed within on the core bar 1, lower contact 3 is bound up by screw thread and core bar 1, arrive together by the lower end riveted of rivet 4 with lower contact 3 and core bar 1.

Centralizer is installed in the middle appropriate location of sucker rod, transfer in the oil pipe 6 in the oil well, the position that bending or inclination are arranged at oil pipe, centralizer body 2 on the centralizer can touch the inner surface (being actually two face contacts) of oil pipe 6 on the vertical curve at an a, some b (perhaps putting c, some d) two places, and forms a meniscate gap 5 between them.When centralizer moved up and down with sucker rod, because of the upper and lower side of centralizer body 2 is slick and sly circular arc chamferings, crude oil can enter into gap 5, and produce a thrust, sucker rod is moved to the oil pipe center, reduce the frictional force between centralizer and the oil pipe, can prolong their application life.

Claims

1, a kind of drifting type oil pumping rod centering device is made of the centralizer body (2) that is sleeved on the core bar (1), and core bar (1) is connected with lower contact (3) by screw thread, it is characterized in that:

1. the cross-sectional profile of centralizer body (2) is a Long Circle, and this Long Circle is made up of 4 sections circular arcs, and the arc radius between arc radius between the some a-point b and the some c-point d is greater than the interior pore radius of oil pipe (6);

2. oblong center to the oblong circumference beeline greater than the rod collar radius;

3. the top and bottom of centralizer body (2) have the chamfering of circular arc respectively.

2, drifting type oil pumping rod centering device according to claim 1 is characterized in that, by rivet (4) core bar (1) lower end and lower contact (3) is riveted together.